Osteoarthritis (OA) is the most common muscu-loskeletal disease and is responsible for decreasing the quality of life among young, active athletes as well as elderly people [1]. The number of people who are affected by OA is increasing due to the increasing age of the population. Obesity, excessive stress to the knee (at work or in sports), previous knee injury, and muscle weakness around knee are known as risk factors [2-5]. In analyzing preventive possibilities, these risk factors are very important.The aim of this review is to evaluate the prevalence of knee OA and the relationship between sports activity and OA. Furthermore to summarize the prevention and treatment of the knee OA and cartilage injury in sports, in order to reduce the increasing impact of knee OA.
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